厚煤层直墙半圆拱巷道围岩破坏影响研究
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摘要
采用FLAC~(3D)数值模拟的方法,分析了不同埋深、不同侧压系数下厚煤层直墙半圆拱形巷道围岩塑性区发育特征、应力分布特征和围岩变形特征。研究表明:随着埋深的加大,巷道的围岩变形量呈线性增加,围岩破坏深度更大且塑性区呈环绕形分布;侧压系数对巷道的破坏形态影响较大,当侧压系数为0.5时,塑性区的分布呈现出"蝶翼形",随着侧压系数逐渐增大到1时,塑性区分布呈"帆船形",分布较为均匀,侧压系数继续增加后,巷道逐渐成"窄高形"并最后发展成"沙漏形"。对鱼卡矿回风巷支护方案进行了优化,采用锚网索联合支护,并对巷道表面进行喷浆,巷道稳定后顶板下沉量为35 mm,帮部位移量为50 mm,满足安全生产需要。
Using FLAC~(3D) numerical simulation as the main method, the influence of plastic zone development characteristics,stress distribution characteristics and deformation characteristics of surrounding rock in the surrounding rocks of the straight wall of thick coal seam with different buried depth and different lateral pressure coefficients is analyzed.The results show that with the increase of buried depth,the deformation of surrounding rock of roadway increases linearly,the damage depth of surrounding rock is larger and the plastic region is surrounded by shape,and the lateral pressure coefficient has a great influence on the failure form of roadway,and when the lateral pressure coefficient is 0.5,the distribution of plastic zone shows "butterfly Wing shape 1 o'clock",the plastic zone distribution is "sailing shape",the distribution is more uniform,and the lateral pressure coefficient continues to increase,the roadway gradually becomes "narrow high shape" and finally develops into "hourglass shape".The support scheme of the return air lane of the fish truck mine is optimized,the joint support of the anchor net cable is used,and the surface of the roadway is sprayed,the roof sinking is 35 mm after the roadway is stabilized,and the shift of the help area is 50 mm,which satisfies the need of normal safe production.
Using FLAC~(3D) numerical simulation as the main method, the influence of plastic zone development characteristics,stress distribution characteristics and deformation characteristics of surrounding rock in the surrounding rocks of the straight wall of thick coal seam with different buried depth and different lateral pressure coefficients is analyzed.The results show that with the increase of buried depth,the deformation of surrounding rock of roadway increases linearly,the damage depth of surrounding rock is larger and the plastic region is surrounded by shape,and the lateral pressure coefficient has a great influence on the failure form of roadway,and when the lateral pressure coefficient is 0.5,the distribution of plastic zone shows "butterfly Wing shape 1 o'clock",the plastic zone distribution is "sailing shape",the distribution is more uniform,and the lateral pressure coefficient continues to increase,the roadway gradually becomes "narrow high shape" and finally develops into "hourglass shape".The support scheme of the return air lane of the fish truck mine is optimized,the joint support of the anchor net cable is used,and the surface of the roadway is sprayed,the roof sinking is 35 mm after the roadway is stabilized,and the shift of the help area is 50 mm,which satisfies the need of normal safe production.
引文
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